From: Jeff Barratt (jbarratt@COMPSAT.COM)
Date: Mon Apr 21 2003 - 19:11:45 EDT
I have successfully replaced both failed switches and added new switch with
SDD under AIX with no downtime. However, I didn't formally document the
steps. I will do some testing in the lab in the next coupla days and provide
the exact procedure necessary AFAIR: the link will fail back over if you
have procedurally shut down the adapter via datapath set device # path #
offline disconnected the switch and did whatever h/w swap is
necessary(corePID needs to be the same),run datapath set device # path #
online . I am certain I am missing a step or two(maybe rmdev -dl on the dead
paths and a cfgmgr with the new switch in place?).
-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU]On Behalf Of
Lloyd Dieter
Sent: Wednesday, April 16, 2003 6:19 AM
To: aix-l@Princeton.EDU
Subject: Re: Switching the SAN switches.
I agree about the reboot part...apparently, with SDD on AIX, the vpath
will failover on the event of the loss of one link to the surviving
link(s), but it will not "fail back" when the link is restored, unless you
reboot.
AIX seems to be the only platform (that I have seen) for which this is
true.
We ran into that, and thought it was something that we were doing wrong;
spoke to one of the switch vendors, and they confirmed it.
-Lloyd
On Tue, 15 Apr 2003 16:29:17 +0200
"Green, Simon" <Simon.Green@EU.ALTRIA.COM> wrote:
> I don't have a lot of experience with this sort of thing, but the one
> time I did it I had to reboot the server, and I also restarted the tape
> library which was on the other end.
>
> My case might have been different. I was replacing an old FC Hub which
> didn't work with a new FC Switch. (There was nothing actually wrong
> with the hub, it just didn't work properly with AIX.)
>
> Simon Green
> Altria ITSC Europe s.a.r.l.
>
> AIX-L Archive at http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
> AIX FAQ at http://www.faqs.org/faqs/aix-faq/
>
> N.B. Unsolicited email from vendors will not be appreciated.
>
> > -----Original Message-----
> > From: Anthony F. Fiore [mailto:anthony.fiore@NYU.EDU]
> > Sent: 15 April 2003 15:22
> > To: aix-l@Princeton.EDU
> > Subject: Switching the SAN switches.
> >
> >
> > Good Day,
> >
> > We will soon be moving from one SAN switch to another which is
> > attached to a few p660-6H1's on one side of the fabric and an
> > ESS-F20 on
> > the other. The 660's have FC 6227 adapters in them. If we're just
> > replacing the SAN switch and not the Shark, or the Host...does anyone
> > know of any gotcha's when replacing SAN switches?
>
--
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Lloyd Dieter - Senior Technology Consultant
Registered Linux User 285528
Synergy, Inc. http://www.synergyinc.cc ldieter@snrgy.com
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